WASHINGTON – Outrage and expressions of support for Rep. Ilhan Omar flooded social media after a crowd of President Donald Trump's supporters chanted, "Send her back" when he verbally attacked the Minnesota Democrat at a rally Wednesday in North Carolina.

Trump called out Omar and three other liberal congresswomen, all of them minorities, who he said "hate our country." He has leveled volleys against the four women, who call themselves "the Squad," every day this week, beginning with a series of tweets Sunday telling them to "go back" to their countries of origin. A House resolution condemned those comments as racist.

Omar, who arrived in the USA more than 20 years ago after her family fled war-torn Somalia, is the only one of the four congresswomen not born in the USA. Wednesday, Trump criticized Omar for comments she made about Israel that Republican and Democratic lawmakers called anti-Semitic and remarks that were perceived as dismissive of the 9/11 terrorist attacks. He repeated somefalse claims about Omar that circulated online.

"And she looks down with contempt on the hardworking Americans, saying that ignorance is pervasive in many parts of this country," Trump said.

"Send her back," some in the crowd chanted.

Omar quoted from "Still I Rise," a poem by Maya Angelou, which reads, "You may kill me with your hatefulness. But still, like air, I'll rise."

"This is what this president and his supporters" have done to change the USA, which is "supposed to be a country where we allow democratic debate and dissent to take place," Omar said Thursday. "And so this is not about me. This is about us fighting for what this country truly should be and what it deserves to be."

Though Trump did not object to the chants during the rally, he said Thursday that he disagreed with the chant and "wasn't happy with that message."

A number of Democratic presidential candidates were among those who denounced the incident.

"#IStandWithIlhan and am proud to work with her in Congress," said Sen. Bernie Sanders, I-Vt. "Trump is stoking the most despicable and disturbing currents in our society. And that very hatred and racism fuels him. We must fight together to defeat the most dangerous president in the history of our country."

Trump is stoking the most despicable and disturbing currents in our society. And that very hatred and racism fuels him. We must fight together to defeat the most dangerous president in the history of our country.

"Tonight on a stage the President returned to bigotry once again. Inciting hatred – it's what he likes to do," said Sen. Amy Klobuchar, D-Minn.

Tonight on a stage the President returned to bigotry once again. Inciting hatred—it's what he likes to do. The words “Are there no limits to what he will say or do?” ring hollow here, until you answer: there is a limit, & it rests with me—stand up, speak out, organize and VOTE.

"These chants don’t happen by accident," former Texas Rep. Beto O'Rourke said. "They are the product of a president who sees our diversity not as a strength, but as a weakness."

These chants don’t happen by accident. They are the product of a president who sees our diversity not as a strength, but as a weakness. I believe in our country. And I believe, together, not allowing our differences to divide us, we will defeat him and everything he stands for. https://t.co/RKZ6PTQM4g

Sen. Kamala Harris of California said, "It’s vile. It’s cowardly. It’s xenophobic. It’s racist. It defiles the office of the President. And I won't share it here. It’s time to get Trump out of office and unite the country."

It’s vile. It’s cowardly. It’s xenophobic. It’s racist. It defiles the office of the President. And I won't share it here.

"Four days ago, the President of the United States suggested that four elected members of Congress, all women of color, ought to 'go back' to the countries 'from which they came.' And every day since he has repeated this ugly, racist refrain," former Vice President Joe Biden tweeted.

Four days ago, the President of the United States suggested that four elected members of Congress, all women of color, ought to "go back" to the countries "from which they came." And every day since he has repeated this ugly, racist refrain.

"We’ve heard it before throughout our history, but it has no place in America in 2019," Biden said.

"This kind of politics, sadly, we've seen before," said Sen. Cory Booker of New Jersey on MSNBC. He compared Trump's rhetoric to that of the 19th-century anti-immigrant American Party – commonly known as the "Know-Nothing Party" – and to that of the 20th-century segregationist George Wallace.

Sen. Kirsten Gillibrand of New York equated it to the "lock her up" chant about Trump's 2016 opponent Hillary Clinton that was regularly heard at his other rallies. She compared it to Trump's infamous remarks on an "Access Hollywood" recording in 2005 as expressions of "contempt for women and anyone who threatens this president's fragile ego."

"He should be afraid. We are his worst nightmare. And we will beat him," Gillibrand said.

Whether it's "send her back" or "lock her up," "there has to be some form of punishment" or "grab her by the p***y"—the throughline is contempt for women and anyone who threatens this president's fragile ego.

He should be afraid. We are his worst nightmare. And we will beat him.

"This president is desperate," tweeted Sen. Elizabeth Warren, D-Mass. "Calling out his racism, xenophobia, and misogyny is imperative."

Warren said the president is "trying to divide us and distract from his own crimes, and from his deeply unpopular agenda of letting the wealthy and well-connected rip off the country." She called for his impeachment.

This president is desperate. Calling out his racism, xenophobia, and misogyny is imperative. But he’s trying to divide us and distract from his own crimes, and from his deeply unpopular agenda of letting the wealthy and well-connected rip off the country. We must do more.

South Bend, Indiana, Mayor Pete Buttigieg said, "We denounce and reject the president's racist demagoguery – without letting him deny attention to today's extremely important vote on the minimum wage."

This is a day for doing more than one thing at a time. We must denounce and reject the president’s racist demagoguery—without letting him deny attention to today’s extremely important vote on the minimum wage.

"I have just one question after the president's rally last night," billionaire Tom Steyer tweeted. "Why aren't racism and inciting a mob against an American & sitting Congresswoman impeachable offenses?"

To each of the 137 Democrats who voted to table an impeachment resolution yesterday, I have just one question after the president's rally last night: Why aren't racism and inciting a mob against an American & sitting Congresswoman impeachable offenses?

Author Marianne Williamson said on CNN that Trump's speech was "dangerous" and that it was very important "for all patriotic Americans, whether we're on the left or the right, to be very clear that we don't do that in America. Our political opponents are not our enemies."

"I challenge every Republican to watch @realDonaldTrump’s rally last night, complete with chants of 'Send her back', and ask if that is the Party of Lincoln and Reagan we signed up for," tweeted former Massachusetts Gov. Bill Weld, Trump's lone challenger for the Republican nomination.

I challenge every Republican to watch @realDonaldTrump’s rally last night, complete with chants of “Send her back”, and ask if that is the Party of Lincoln and Reagan we signed up for. We are in a fight for the soul of the GOP, and silence is not an option. #AmericaDeservesBetter

Minority Leader Charles Schumer, D-N.Y., addressed the chant during a speech from the Senate floor Thursday, denouncing "the way the president appeals to the worst instincts of people."

"What was shouted and chanted at the rally last night without the president upbraiding them" was "despicable," he said.

Schumer said it was "eerily familiar to what happens in dictatorships."

House Judiciary Committee Chairman Jerry Nadler, D-N.Y., said it was "chilling and horrifying" to watch Trump "spreading racist and xenophobic propaganda" about Omar.

"There is no place for such racism in our public discourse," he said.

Watching the President lie (again) to the American people, spreading racist and xenophobic propaganda against @Ilhan with the crowd being goaded into chants of “send her back” was both chilling and horrifying. There is no place for such racism in our public discourse. https://t.co/SHm3Svb8Mx

Sen. Brian Schatz, D-Hawaii, said the "send her back" chant was worse than "lock her up" because "they don’t even have the false pretext of alleged corrupt behavior."

"They are just telling an American with whom they disagree to go back to Africa."

On some level “send her back” sounds similar to “lock her up.” But here is how it is worse to my ears. Now they don’t even have the false pretext of alleged corrupt behavior. They are just telling an American with whom they disagree to go back to Africa.

Like Gillibrand, Rep. Jackie Speier, D-Calif., saw the chant as an expression of misogyny and compared it to other insults Trump leveled at women over the years.

“Send her back. Lock her up. Nasty woman. Horse face. That dog. Face of a pig. Not my type. Fat. Disgusting. Low IQ. Slob. Pocahontas. Blood coming out of her wherever. Look at that face. Grab them by the pussy.”

Rep. Mark Walker, R-N.C., said on Twitter that even though "it was brief" and Omar had a "great disdain" for the USA and Israel, he "struggled" with the chant. He said the focus should be on Omar's positions and "not phrasing that's painful to our friends in the minority communities."

Though it was brief, I struggled with the “send her back” chant tonight referencing Rep. Omar. Her history, words & actions reveal her great disdain for both America & Israel. That should be our focus and not phrasing that’s painful to our friends in the minority communities.

"I deeply disagree with the extreme left & have been disgusted by their tone," tweeted Rep. Adam Kinzinger, R-Ill. "I woke up today equally disgusted – chants like 'send her back' are ugly, wrong, & would send chills down the spines of our Founding Fathers. This ugliness must end, or we risk our great union"."

I deeply disagree with the extreme left & have been disgusted by their tone. I woke up today equally disgusted - chants like “send her back” are ugly, wrong, & would send chills down the spines of our Founding Fathers. This ugliness must end, or we risk our great union.

"A chant like 'Send her back!' is ugly and dangerous, and it is the inevitable consequence of President Trump’s demagoguery," said Rep. Justin Amash, who recently left the Republican Party. "This is how history’s worst episodes begin. We must not allow this man to take us to such a place."

"It saddens me beyond belief that the standard-bearer for the Republican Party, my Party, is making 'Send her back' his re-election rallying cry. It’s so ugly. It’s so un-American. It just saddens me beyond belief," said former Illinois Rep. Joe Walsh.

It saddens me beyond belief that the standard-bearer for the Republican Party, my Party, is making “Send her back” his re-election rallying cry.

Conservative radio host Hugh Hewitt called it a "nativist, terrible chant" and "electoral suicide."

"Send her back" is a nativist, terrible chant. Also electoral suicide. There're more than 400,000 naturalized residents in PA, w/ 200,000 more in Michigan. @realdonaldTrump won PA by and MI by 11K, PA by 44K. #VoteHerOut --fine. #SendHerBack --nativist. Catholics, btw, remember.

"We need to be better than chanting #SendHerBack," tweeted self-described Christian conservative Carmine Sabia. "Rep. Ilhan Omar is an American citizen. A self righteous, America hating, anti semitic, bigoted, socialist citizen. But a citizen nonetheless. We do not deport citizens. Disagree with her but do not chant that."

We need to be better than chanting #SendHerBack. Rep. Ilhan Omar is an American citizen. A self righteous, America hating, anti semitic, bigoted, socialist citizen. But a citizen nonetheless. We do not deport citizens. Disagree with her but do not chant that.

So as to this “send her back” thing: any American Jew who doesn’t understand our obligation to protect and speak on her behalf is ignoring the true lesson of the holocaust. Othering people leads to desensitizing leads to dehumanizing leads to destruction.

You don't have to agree with everything (or anything) naturalized US citizen Rep. Ilhan Omar says to stand with her tonight. I hope you will RETWEET this if, like me, your response to the vile chants of "Send her back!" at Trump's hateful North Carolina rally is #IStandWithIlhan.

This is one of the single most racist moments in modern American political history. As Trump began attacking my friend Congresswoman Ilhan Omar, the crowd began chanting “SEND HER BACK, SEND HER BACK.” It’s utterly despicable and dangerous. We are here. We are in THAT time. UGLY. pic.twitter.com/6M0PBXe4Lr

Trump and his followers, who now chant “Send her back” at his rallies, have shown the vile depth they will go to just to hold on to power. Now it is time each of us showed how far we will go to defeat Trumpism in 2020. It’s all hands on deck, all good people to the ballot box.

A cult of white supremacists chanting “send her back” in support of Donald Trump’s racist attack on Ilhan Omar. Fascism spreads like wildfire. Especially when it comes from the President of the United States of America. Chilling to my core. pic.twitter.com/mQ0Cy0ffMw

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From left, Rep. Rashida Tlaib, Rep. Ilhan Omar, Rep. Alexandria Ocasio-Cortez and Rep. Ayanna Pressley respond to remarks by President Donald Trump after his call for the four Democratic congresswomen to go back to their "broken" countries, during a news conference at the Capitol in Washington, Monday, July 15, 2019. All are American citizens and three of the four were born in the U.S. J. Scott Applewhite, AP

Rep. Alexandria Ocasio-Cortez, left, and Rep. Rashida Tlaib laugh as they wait for other freshman Congressmen to deliver a letter calling to an end to the government shutdown on January 16, 2019. Andrew Harnik, AP

Alexandria Ocasio-Cortez and Ilhan Omar attend a press conference calling on Congress to cut funding for US Immigration and Customs Enforcement and to defund border detention facilities, outside the US Capitol in Washington, DC on February 7, 2019. Saul Loeb, AFP/Getty Images

Rashida Tlaib, center, wipes her eyes while testifying before the House Oversight Committee hearing on family separation and detention centers on July 12, 2019 on Capitol Hill in Washington. Pablo Martinez Monsivais, AP

Rashida Tlaib, left, and Ayanna Pressley whisper during a hearing on the Trump Administration's policy on separating migrant children from their families on July 12, 2019 in Washington. Yehyun Kim, USAT

Ayanna Pressley hugs Alexandria Ocasio-Cortez following a press conference before a House Oversight and Reform subcommittee hearing on Capitol Hill on July 10, 2019 in Washington, DC. Zach Gibson, Getty Images